Process of coating objects with subdivided material.



F. F. BRADLEY. PROCESS OF COATING OBJECTS WITH SUBDIVIDED MATERIAL.

APPLICATION FILED DEO.15, 1911.

1,034,761. Patented Aug. 6, 1912.

2 SHEETS-SHEET 1.

F. F. BRADLEY.

PROCESS OF COATING OBJECTS WITH SUBDIVIDED MATERIAL. APPLICATION FILED DEO,15. 1911.

1,034,761. Patented Aug. 6, 1912.

2 SHEETS SHEET 2 I ruary 'FRENKLIN BRADLEY, OF CHICAGO, ILIiINOIS'fASSIGNOR T0 BRADLEY AND V3100- MAN-COMPANY, or curoaeo; ILLINOIS, A conrortn'rron" or ILLINOIS.-

PROGESS 0F COATING OBJECTS WITH SUBDIVIDfEll MATERIAL.-

Specification of Letters Patent.

Patented Aug. e, 1912;.

Original application filed October 14, 1911,Serial No. 654,678. Divided. and this application filed December 15, 1911.- Serial No. 665,955.

To all whom it may concern Be it known that I, FRANKLIN F. BRAD- LEY, citizen of the United States, residing at Chicago, in the county of Cook and State of "Illinois,- haveinvented a-certain new, and useful Improvement in Processes of Coating Objects with Subdivided Material, of which the following is a full, clear, concise, and

accompanying drawings, forming a part of powdered material and is of particular serv ice in spreading bronze powder upon objects Whose surfaces are coated or covered or painted with suitable adhesive material or paint, which in its fresh state holds the powder scattered thereupon and in its dry state firmly fixed the powder in place.

The present application 1s a division of my original application -No. 654,678,!iled October 14, 1911.

I have filed other applications relating to the coating of objects with subdivided material that are now pending and which are listed as follows: Serial Nd-543,215, filed February 11, 1910, Serif No. 550,115, filed March 18, 1910,- Serial N 0. 603,726, filed-January 21,1911, Serial No. 611,042, filed Feb- 27, 1911, and Serial No. 588,731, filed October 24,-1910.

' I will explain my invention more fully by reference to the accompanying drawings showing the preferred form of apparatus which is employed.

In-the drawings Figure 1 is a sectional elevation of the preferred form of apparatus; Fig. 2 is a sectional view on line 2 2 of Fig. 1; and Fig. 3 is'an elevation, illus-- "-trated on a smaller scale than Figs. 1 and 2,

of the apparatus. Like parts are indicated by similar characters of reference throughout the-different surface curved substantially -throughout, this'cur'vature being preferably spherical. The" receptacle is desirably made of sheet metal and is thereforepreferably' globular in form. The receptacle. substantially confines a body of air within its interior, a door employed" for 'substantially completely c osing the receptacle, this a being preferabl door being of'such a size as to permit the ob ects that are to be coated with the sub divided material to be passedthrough the .door opening as these objects are placed within and withdrawn from the receptacle. It is understood that the receptacle is preferably stationary and that it may contain suitable supports for the objects that are to be coated.

The machine'illustrated is adapted particularly to the application of subdivided material, such as bronze powder, to the sized surfaces of metal beds, a support a suitable for the location of bed structures thereupon being employed. I employ fans I) b at the horizontal poles of the globular structure, these fans being known as cone fans which are obtained upon the market from the Bufialo Forge Company, of Buffalo, New York. These fans are mounted upon shafts b that are driven by the 'belts b in the directions indicated by the arrows illustrated upon the belts.

The object having a multiplicity of surfaces to be coated such as those with which a metal bed end 0, for example, is provided, is supported within the receptacle upon the object support a the object 0 having first received a coating of suitable adhesive ma- ;terial such as wet varnish. The object is thus substantially surrounded in substan; .tially all'planes by the body of gas. The

subdivided material, such as bronze powder, is admitted to the receptacle. interior through thechannels d. The object c, which is located between the fans I), has air directed thereupon by the fans in streams of opposite directions, the opposing streams of air mingling at the bed 'end 0 and there thoroughly distributing bronze powder which is carried by the air, upon the bed end. The-bronze powderiscarried by the air and the'air which carries the bronze powder is moved "by the fans in the manner described so that the airwillcarry the particles of bronze powderthat float therein to the coated object'where the 1 particles of bronze powder will settle, I, speak of the bronze, powder as floating upon'the air, meaning that the airlhas floating action ,upon the bronze powder; for a sufficient length of time to enable the air to carry the bronze powder --to 1 the parts that are: to be coated therewith. It is possible for the parcourse of time but owing of the interior of the casing the currents. of

ticles of bronze powder to settle in the to the curvature air are so directed toward the fans that any particles which have settled will be caught up and returned to the streams of air flowing toward the object that is to becoated The curved surface readily ides the air toward the fans after the ig have discharged the air toward the object to be coated so that friction is much reduced and,

the power which is required to operate the fans is greatly lessened.

I prefer at first to operate the fans at equal speeds, say seven hundred revolutions per minute, so that o posing streams of air 4 are directed toward t e object to be coated at substantially equal ressures, the fans bea ing of similar capacity and operating to force air at equal pressures when running at equal speeds, these opposing streams of air mingling at the object 0 and there efiecting thorough distribution of the bronze particles to enable these bronze particles to reach all of the surfacesthat are coated with adhesive material. To improve and make more certain the results of the operation I also operate the left hand fan at a speed of say three hundred and fifty revolutions and the right hand fan at one thousand two hundred revolutions and thereafter reverse these speeds so as to cause the left hand fan to ro-= tate at one thousand two hundred revolutions per minute and the right hand fan at three hundred and fifty revolutions 'per' minute. In this way the stream of air whose passage is forced by each fan alternately predominates over and is alternately predominated over by the stream due to the other fan so that the particles of subdivided material are with certainty conveyed to all parts of the object to be coated that are provided with adhesive material. After the object has been left within the receptacle a sufiicient length of time to enable it to be coated, the belts 5 are shifted to loose pulleys and the fans 6 are allowed suflicient y to slow down or stop wher'eafter the door a is opened and the object which is then coated with subdivided material is withdrawn. The blades of the fans are so shaped as to enable the fans to,

force the air to move from them in comparatively definite directions toward and by the object to be coated, the interior surface of the receptaclecooperating with the fans to efi'ect return of the air to the same.

Air or any other suitable gas which is inert with respect to the substances may be employed in my process.

While 'I'prefer fans I; of the precise con i struction shown for accomplishing the results which are'the object of myinve'ntion,

I do not wish to be limited to the employment of these instrumentalities within the receptacle for defining the eneralpath followed by the air where it as fullest flow,

and while the blades of the fans are, by reason Of'tl'lGiI entire location within the re ceptacle, particularly well adapted to effect return movement of the air to the fans, I do not wish to be limited to the employment of fans within the receptacle interior.

Claims upon the apparatus herein disclosed, are presented in my co-pendin application Serial No. 654,67 9, filed October 14,

Having thus described my invention, I

claim as new and desire to secure by Letters Patent the following: i

1. The process of coating objects having a multiplicity of surfaces with subdivided material which consists in placing adhesive material upon a multiplicity of surfaces of the object to be coated, substantiall confining a body of as in which the sub ivided maobject is located whereby various parts of the object having adhesive material thereon are coated with the subdivided material.

2. The process of coating objects having a multiplicity of surfaces with subdivided material which consists inplacing adhesive material upon 'a multiplicity of'surfaces of the object to be coated, substantially confining abody of gas in which the subd1v1ded 'mate-.

rial is adapted to float, distributing the subdivided material with which the object isto be coated in the body of gas, substantially surrounding the object in 'substantlally all planes by the body of gas, causing some of the gas in which subdivided material is floatto flow by the object in o posing streams under unequal pressures w 1ch alternately predominate upon the opposite sides of the object to be coated, and causingthe opposi'n streams to mingle where the ob ect 1s locat whereby various parts of the ob ect having adhesive material thereon are coated with the subdivided material. In witness whereof, my name this 29th day of November A. 1).,

FRANKLIN F. BRADLEY.

.Witnesses:

G. L. Cruse, E. L. WHITE.

I hereunto subscribe 

